A flange with multiple sealing surfaces

Abstract

The utility model relates to the field of flange technology, and discloses a flange with a multi-layer sealing surface, including a valve body flange, a valve cover flange and a sphere, wherein the valve body flange and the valve cover flange are in conflict with each other, and the conflicting part is a metal-to-metal seal, and a spiral wound gasket is arranged between the valve body flange and the valve cover flange, and the spiral wound gasket is located below the metal-to-metal seal. In this flange with a multi-layer sealing door, when the flanges are connected, due to the compact space, the metal contact surface cannot be too wide, so as to avoid the increase in the tightening pressure of the bolts and damage the surface finish. By adding a multi-layer metal seal, the sealing performance of the pressure test flange is improved, the compression amount of the spiral wound gasket is controlled, and the service life is extended. The sealing surface type of the flange connection between the valve cover and the valve body adopts a Spik groove structure to ensure safe and reliable sealing, so that no pollutants fall into the valve cavity when the gasket is compressed.

Description

Technical Field

[0001] The utility model relates to the technical field of flanges, in particular to a flange with multi-layer sealing surfaces. Background Art

[0002] A ball valve is a valve whose opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can be used for regulating and controlling fluids.

[0003] The hard-sealed V-type ball valve has a strong shear force between its V-shaped ball core and the metal valve seat with welded carbide, which is particularly suitable for media containing fibers, tiny solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, diversion and flow direction switching of the media in the pipeline, but also close any channel and connect the other two channels. [1] Ball valves are divided into pneumatic ball valves, electric ball valves, and manual ball valves according to the driving method. Ball valves are widely used in oil refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electricity, municipal administration, steel and other industries

[0004] The existing ball valve structure mainly relies on the spiral wound gasket for sealing; if the finish of the processed surface does not meet the requirements, the spiral wound gasket's sealing requirements cannot be met, leakage will occur. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a flange with a multi-layer sealing surface, which solves the problem that the smoothness of the processed surface does not meet the requirements, the sealing requirements of the spiral wound gasket do not meet the requirements, and leakage occurs.

[0006] The utility model provides the following technical solution: a flange with a multi-layer sealing surface, comprising a valve body flange, a valve cover flange and a sphere, the valve body flange and the valve cover flange are in conflict with each other, the conflicting part is a metal-to-metal seal, a spiral wound gasket is arranged between the valve body flange and the valve cover flange, and the spiral wound gasket is located below the metal-to-metal seal.

[0007] Preferably, a spherical cavity is formed between the valve body flange and the valve cover flange, the sphere is arranged in the spherical cavity, and a valve seat is provided between the spherical cavity and the sphere.

[0008] Preferably, the outer surfaces of the valve body flange, the valve cover flange and the sphere are all provided with channels, and the three channels are adapted to each other.

[0009] Preferably, a valve stem is inserted into the outer surface of the valve cover flange, a packing is provided between the valve stem and the valve cover flange, and a packing pressure plate is provided above the packing.

[0010] Preferably, the outer surface of the valve stem is provided with two mounting grooves, and anti-static balls are provided in the two mounting grooves.

[0011] Preferably, the compression range of the spiral wound gasket is 10%-15%.

[0012] Preferably, the sealing surface type of the connection between the valve body flange and the valve cover flange adopts a SPIKE groove structure.

[0013] Compared with the prior art, the present invention provides a flange with a multi-layer sealing surface, which has the following beneficial effects:

[0014] This is a flange with multiple layers of sealing surfaces. The sealing surface type of the valve cover and the flange in the valve body adopts a SPIKE groove structure to ensure safe and reliable sealing, so that no pollutants fall into the valve cavity when the gasket is compressed. At the same time, the metal-to-metal contact has a certain contact pressure on the contact surface, which also has a certain protective effect. There is no leakage, the sealing gasket structure is reliable and environmentally friendly. This design embodies the concept of green environmental protection to fully reduce the erosion of the medium on the gasket and increase the service life of the gasket. Reduce or avoid the number of valve repairs during service.

[0015] This kind of flange with multi-layer sealing surface needs to accurately control the compression of the spiral wound gasket and the gap between the body cover and the SPX groove to ensure metal-to-metal contact. The compression of the spiral wound gasket is controlled at 10%-15% to ensure that the medium cannot leak after the gasket is compressed, and the metal between the body cover is in metal-to-metal contact under the force of the fasteners to prevent the spiral wound gasket from being over-compressed.

[0016] This flange has a multi-layer sealing surface. When the flanges are connected, due to the compact space, the metal contact surface cannot be too wide to prevent the increase in bolt tightening pressure from damaging the surface finish. By adding multi-layer metal seals, the sealing performance of the pressure test flange is improved, the compression of the spiral wound gasket is controlled, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 For the utility model Figure 1 A is an enlarged view of the structure.

[0019] In the figure: 1. Valve body flange; 2. Valve cover flange; 3. Ball; 4. Metal seal; 5. Spiral wound gasket; 6. Valve seat; 7. Channel; 8. Valve stem; 9. Packing; 10. Packing pressure plate; 11. Mounting groove. DETAILED DESCRIPTION

[0020] See also Figure 1-2A flange with a multi-layer sealing surface includes a valve body flange 1, a valve cover flange 2 and a ball 3. The valve body flange 1 and the valve cover flange 2 are in conflict with each other, and the conflicting part is a metal-to-metal seal 4. The sealing surface type of the valve body flange 1 and the valve cover flange 2 adopts a Spik groove structure. A spiral wound gasket 5 is arranged between the valve body flange 1 and the valve cover flange 2. The spiral wound gasket 5 is located below the metal-to-metal seal 4, and the compression range of the spiral wound gasket 5 is 10%-15%.

[0021] A spherical cavity is formed between the valve body flange 1 and the valve cover flange 2, and the sphere 3 is arranged in the spherical cavity. A valve seat 6 is arranged between the spherical cavity and the sphere. Channels 7 are opened on the outer surfaces of the valve body flange 1, the valve cover flange 2 and the sphere. The three channels 7 are adapted to each other. A valve stem 8 is interspersed on the outer surface of the valve cover flange 2. A packing 9 is arranged between the valve stem 8 and the valve cover flange 2. A packing pressure plate 1 is arranged above the packing 9. Two mounting grooves 11 are arranged on the outer surface of the valve stem 8. Antistatic balls are arranged in the two mounting grooves 11.

[0022] In summary, the flange with multiple layers of sealing surfaces, the sealing surface type of the valve cover and the flange in the valve body adopts the SPIKE groove structure, which ensures safe and reliable sealing, so that no pollutants fall into the valve cavity when the gasket is compressed. At the same time, the metal-to-metal contact has a certain contact pressure on the contact surface, which also has a certain protective effect, no leakage, and the sealing gasket structure is reliable and environmentally friendly. This design embodies the concept of green environmental protection to fully reduce the erosion of the medium on the gasket and increase the service life of the gasket. Reduce or avoid the number of valve repairs during service.

[0023] This kind of flange with multi-layer sealing surface needs to accurately control the compression of the spiral wound gasket and the gap between the body cover and the SPX groove to ensure metal-to-metal contact. The compression of the spiral wound gasket is controlled at 10%-15% to ensure that the medium cannot leak after the gasket is compressed, and the metal between the body cover is in metal-to-metal contact under the force of the fasteners to prevent the spiral wound gasket from being over-compressed.

[0024] This flange has a multi-layer sealing surface. When the flanges are connected, due to the compact space, the metal contact surface cannot be too wide to prevent the increase in bolt tightening pressure from damaging the surface finish. By adding multi-layer metal seals, the sealing performance of the pressure test flange is improved, the compression of the spiral wound gasket is controlled, and the service life is extended.

Claims

1. A flange with a multi-layer sealing surface, comprising a valve body flange (1), a valve cover flange (2) and a sphere (3), characterized in that: The valve body flange (1) and the valve cover flange (2) are in contact with each other, and the contacting portion is a metal-to-metal seal (4). A spiral wound gasket (5) is provided between the valve body flange (1) and the valve cover flange (2), and the spiral wound gasket (5) is located below the metal-to-metal seal (4).

2. A flange with a multi-layer sealing surface according to claim 1, characterized in that: A spherical cavity is formed between the valve body flange (1) and the valve cover flange (2), the sphere (3) is arranged in the spherical cavity, and a valve seat (6) is provided between the spherical cavity and the sphere.

3. A flange with a multi-layer sealing surface according to claim 2, characterized in that: The valve body flange (1), the valve cover flange (2) and the outer surface of the sphere are all provided with channels (7), and the three channels (7) are adapted to each other.

4. The flange with multi-layer sealing surface according to claim 1, characterized in that: A valve stem (8) is inserted into the outer surface of the valve cover flange (2), a packing (9) is provided between the valve stem (8) and the valve cover flange (2), and a packing pressure plate (10) is provided above the packing (9).

5. A flange with a multi-layer sealing surface according to claim 4, characterized in that: The outer surface of the valve stem (8) is provided with two mounting grooves (11), and anti-static balls are provided in the two mounting grooves (11).

6. The flange with multi-layer sealing surface according to claim 1, characterized in that: The compression range of the spiral wound gasket (5) is 10%-15%.

7. The flange with multi-layer sealing surface according to claim 1, characterized in that: The sealing surface type of the connection between the valve body flange (1) and the valve cover flange (2) adopts a SPIKE groove structure.

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